A permeable reactive wall composite material for groundwater chlorine-containing nitroaromatic pollution restoration and preparation method thereof

Abstract

Belonging to the technical field of groundwater remediation, the invention discloses a permeable reaction barrier composite material for remediation of groundwater chlorine and nitro-containing aromatic hydrocarbon pollution and a preparation method thereof. The composite material consists of a core, a filler layer and a shell, the core material is attapulgite, the filler layer comprises: 10.4-15.3% of a reducing agent, 33.3-35.1% of a carbon raw material, 21.7-26% of a plastic bonding raw material, 9-10.8% of a high permeability raw material, and the balance an adhesive, and the shell includes: 10.5-11.9% of a high permeability raw material, 66.7-70.9% of a plastic bonding raw material, and the balance an adhesive. The composite material provided by the invention has the effect of slow release of the reducing agent and carbon source, has the advantages of low cost, simple preparation method, environmental protection and no pollution, can quickly and effectively remove chlorine and nitro-containing aromatic hydrocarbon pollutants, and has broad application prospects in the field of groundwater pollution remediation.

Description

technical field

[0001] The invention belongs to the technical field of groundwater remediation, and more specifically relates to a permeable reactive wall composite material used for the remediation of chlorine-containing and nitroaromatic hydrocarbon pollution in groundwater and a preparation method thereof. Background technique

[0002] Chlorine- and nitro-containing aromatics are important organic raw materials, widely used in dyes, medicines, pesticides, rubber additives, engineering plastics and other fields. my country has become a major producer and supplier of chlorinated and nitroaromatics, accounting for 60% of global production. However, chlorinated and nitroaromatics are persistent organic pollutants that are highly toxic and have Teratogenicity, strong carcinogenicity and mutagenicity, poor biodegradability, seriously threaten the safety of the ecological environment. Due to the infiltration of chlorine-containing and nitro-aromatics into soil and groundwater du...

Examples

Embodiment 1

[0049] The permeable reactive wall composite material used for the restoration of chlorine-containing nitroaromatics pollution in groundwater in this embodiment 1 includes an inner core, a filling layer and an outer shell, the inner core is attapulgite, and the filling layer is composed of the following components in mass percentage : Reducing agent Fe-Cu bimetallic 10.4%, mainly to create a strong reducing environment for the removal of chlorine-containing and nitro-aromatic hydrocarbons, the carbon release raw material is coconut shell biochar 35.1%, mainly to ensure the carbon source required for microbial growth; plasticity The bonding raw material attapulgite is 26%, mainly to bond all raw materials together and maintain a certain hardness; the high-permeability raw material diatomite is 10.8%, mainly to provide natural channels for the growth and reproduction of microorganisms, and to ensure that the composite material can slow down. Reducing agent and carbon source; the ...

Embodiment 2

[0068] The permeable reactive wall composite material used for the restoration of chlorine-containing nitroaromatics pollution in groundwater in this embodiment 2 is basically the same as in embodiment 1, except that the filling layer is composed of the following components in mass percentage: reducing agent Fe- Cu bimetal is 12%, carbon release raw material is coconut shell biochar 34%, plastic bonding raw material attapulgite 23%, high permeability raw material diatomite 9.5%, binder (mixture of sodium alginate and water) was 21.5%. The shell is made up of the following components in mass percentage: 11% of high-permeability raw material diatomite, 66.7% of plastic bonding raw material (20.9% of ordinary Portland cement, 45.8% of attapulgite), binder (seaweed A mixture of sodium bicarbonate and water) was 22.3%. The coconut shell biochar used in the composite functional material of this embodiment is 150 mesh, the attapulgite and diatomite are 170 mesh, and the cement is 90...

Embodiment 3

[0073] The permeable reactive wall composite material used for the restoration of chlorine-containing nitroaromatics pollution in groundwater in this embodiment 3 is basically the same as in embodiment 1, except that the filling layer is composed of the following components in mass percentage: reducing agent Fe- Cu bimetal is 15.3%, carbon release raw material is coconut shell biochar 33.3%, plastic bonding raw material attapulgite 21.7%, high permeability raw material diatomite 9%, binder (mixture of sodium alginate and water) was 20.7%. The shell is made up of the following components in mass percentage: 11.9% of high-permeability raw material diatomite, 67% of plastic bonding raw material (23.8% of ordinary Portland cement, 43.2% of attapulgite), binder (seaweed A mixture of sodium bicarbonate and water) was 21.1%. The coconut shell biochar, attapulgite and diatomite used in the composite functional material of this embodiment are 200 mesh, and the cement is 100 mesh.

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technical field

[0001] The invention belongs to the technical field of groundwater remediation, and more specifically relates to a permeable reactive wall composite material used for the remediation of chlorine-containing and nitroaromatic hydrocarbon pollution in groundwater and a preparation method thereof. Background technique

[0002] Chlorine- and nitro-containing aromatics are important organic raw materials, widely used in dyes, medicines, pesticides, rubber additives, engineering plastics and other fields. my country has become a major producer and supplier of chlorinated and nitroaromatics, accounting for 60% of global production. However, chlorinated and nitroaromatics are persistent organic pollutants that are highly toxic and have Teratogenicity, strong carcinogenicity and mutagenicity, poor biodegradability, seriously threaten the safety of the ecological environment. Due to the infiltration of chlorine-containing and nitro-aromatics into soil and groundwater du...

Examples

Embodiment 1

[0049] The permeable reactive wall composite material used for the restoration of chlorine-containing nitroaromatics pollution in groundwater in this embodiment 1 includes an inner core, a filling layer and an outer shell, the inner core is attapulgite, and the filling layer is composed of the following components in mass percentage : Reducing agent Fe-Cu bimetallic 10.4%, mainly to create a strong reducing environment for the removal of chlorine-containing and nitro-aromatic hydrocarbons, the carbon release raw material is coconut shell biochar 35.1%, mainly to ensure the carbon source required for microbial growth; plasticity The bonding raw material attapulgite is 26%, mainly to bond all raw materials together and maintain a certain hardness; the high-permeability raw material diatomite is 10.8%, mainly to provide natural channels for the growth and reproduction of microorganisms, and to ensure that the composite material can slow down. Reducing agent and carbon source; the ...

Embodiment 2

[0068] The permeable reactive wall composite material used for the restoration of chlorine-containing nitroaromatics pollution in groundwater in this embodiment 2 is basically the same as in embodiment 1, except that the filling layer is composed of the following components in mass percentage: reducing agent Fe- Cu bimetal is 12%, carbon release raw material is coconut shell biochar 34%, plastic bonding raw material attapulgite 23%, high permeability raw material diatomite 9.5%, binder (mixture of sodium alginate and water) was 21.5%. The shell is made up of the following components in mass percentage: 11% of high-permeability raw material diatomite, 66.7% of plastic bonding raw material (20.9% of ordinary Portland cement, 45.8% of attapulgite), binder (seaweed A mixture of sodium bicarbonate and water) was 22.3%. The coconut shell biochar used in the composite functional material of this embodiment is 150 mesh, the attapulgite and diatomite are 170 mesh, and the cement is 90...

Embodiment 3

[0073] The permeable reactive wall composite material used for the restoration of chlorine-containing nitroaromatics pollution in groundwater in this embodiment 3 is basically the same as in embodiment 1, except that the filling layer is composed of the following components in mass percentage: reducing agent Fe- Cu bimetal is 15.3%, carbon release raw material is coconut shell biochar 33.3%, plastic bonding raw material attapulgite 21.7%, high permeability raw material diatomite 9%, binder (mixture of sodium alginate and water) was 20.7%. The shell is made up of the following components in mass percentage: 11.9% of high-permeability raw material diatomite, 67% of plastic bonding raw material (23.8% of ordinary Portland cement, 43.2% of attapulgite), binder (seaweed A mixture of sodium bicarbonate and water) was 21.1%. The coconut shell biochar, attapulgite and diatomite used in the composite functional material of this embodiment are 200 mesh, and the cement is 100 mesh.

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